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Operating Systems AIX Question about HACMP for active-active mode Post 302365449 by qiulang on Tuesday 27th of October 2009 06:10:08 AM
Old 10-27-2009
Question about HACMP for active-active mode

Hi all,

I am new to HACMP. So sorry for the newie question. But I did search the forum and it seems that no one asks this before.

So if a 2-node cluster runs in active-active mode (and the same application), what is the benefit of using HACMP ?

If it runs in active-stanby, it is easy to understand because you need HACMP to do failover; but for active-active mode, no failover (right ?), then why do we need HACMP ?

Besides, I find HACMP documents do not use the term "active-active" or "active-standby" (cold standby or hot standby) often. So does "concurrent resource group" mean "active-active" and "cascading/rotating resource group" mean "active-standby" ? Is there a cold standby ?

And what is the relation between "concurrent resource group" and "concurrent shared disk access"; what's the relation between "Cascading/Rotating resource group" and "non-concurrent shared disk access" ?

Thanks!

Last edited by qiulang; 10-27-2009 at 09:18 AM..
 

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PACEMAKER(8)						  System Administration Utilities					      PACEMAKER(8)

NAME
Pacemaker - Part of the Pacemaker cluster resource manager SYNOPSIS
crm_ticket (query|command) [options] DESCRIPTION
crm_ticket - Perform tasks related to cluster tickets. Allows ticket attributes to be queried, modified and deleted. OPTIONS
-?, --help This text -$, --version Version information -V, --verbose Increase debug output -Q, --quiet Print only the value on stdout -t, --ticket=value Ticket ID Queries: -l, --info Display the information of ticket(s) -L, --details Display the details of ticket(s) -w, --raw Display the IDs of ticket(s) -q, --query-xml Query the XML of ticket(s) -c, --constraints Display the rsc_ticket constraints that apply to ticket(s) Commands: -g, --grant Grant a ticket to this cluster site -r, --revoke Revoke a ticket from this cluster site -s, --standby Tell this cluster site this ticket is standby -a, --activate Tell this cluster site this ticket is active Advanced Commands: -G, --get-attr=value Display the named attribute for a ticket -S, --set-attr=value Set the named attribtue for a ticket -D, --delete-attr=value Delete the named attribute for a ticket -C, --cleanup Delete all state of a ticket at this cluster site Additional Options: -v, --attr-value=value Attribute value to use with -S -d, --default=value (Advanced) The default attribute value to display if none is found. For use with -G -f, --force (Advanced) Force the action to be performed -n, --set-name=value (Advanced) ID of the instance_attributes object to change -i, --nvpair=value (Advanced) ID of the nvpair object to change/delete EXAMPLES
Display the info of tickets: # crm_ticket --info Display the detailed info of tickets: # crm_ticket --details Display the XML of 'ticketA': # crm_ticket --ticket ticketA --query-xml Display the rsc_ticket constraints that apply to 'ticketA': # crm_ticket --ticket ticketA --constraints Grant 'ticketA' to this cluster site: # crm_ticket --ticket ticketA --grant Revoke 'ticketA' from this cluster site: # crm_ticket --ticket ticketA --revoke Make 'ticketA' standby: The cluster site will treat a granted 'ticketA' as 'standby'. The dependent resources will be stopped or demoted gracefully without trig- gering loss-policies # crm_ticket --ticket ticketA --standby Activate 'ticketA' from being standby: # crm_ticket --ticket ticketA --activate Get the value of the 'granted' attribute for 'ticketA': # crm_ticket --ticket ticketA --get-attr granted Set the value of the 'standby' attribute for 'ticketA': # crm_ticket --ticket ticketA --set-attr standby --attr-value true Delete the 'granted' attribute for 'ticketA': # crm_ticket --ticket ticketA --delete-attr granted Erase the operation history of 'ticketA' at this cluster site: The cluster site will 'forget' the existing ticket state. # crm_ticket --ticket ticketA --cleanup AUTHOR
Written by Andrew Beekhof REPORTING BUGS
Report bugs to pacemaker@oss.clusterlabs.org Pacemaker 1.1.10-29.el7 June 2014 PACEMAKER(8)
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